薄膜三重价态锰氧化物的制备与性能

应用偏靶射频磁控溅射方法在SrTiO3(001)单晶衬底上制备了三重价态(Mn3+, Mn4+, Mn5+)锰氧化物薄膜La1-x-yCaxKyMnO3. 这种薄膜具有钙钛矿结构, A位拥有La3＋, Ca2＋和K＋三种离子, 对应的B位为Mn3＋, Mn4＋和Mn5＋三重价态离子共存. 通过18 kW高能X射线衍射仪和D8 X射线面探衍射仪检测证实制备的薄膜为取向多晶薄膜. 原子力扫描图像显示薄膜表面平整, 且随薄膜厚度增加表面平整度起伏增大. 表面光电压测试显示, 该薄膜具有明显的光生电压信号.

Thin Film Preparation and Property of the Perovskite Manganites with Three Oxidation States

Thin films of the perovskite manganese oxides with three oxidation states of Mn3 -Mn4 -Mn5 were successfully prepared on the SrTiO3(001)substrates by off-axis radio frequency magnetron sputtering.The structure of the thin film is cubic with Pm3m space group,consisting of La3 ,Ca2 and K three kinds of ions occupied in A sites and three oxidation states of manganese in B sites,respectively.The as-made La1-x-yCaxKyMnO3 thin films are oriented multi-crystal epitaxial forms,as tested by the high energy(18 kW)X-ray diffraction and D8 discover X-ray diffraction with General Area Detector Diffraction System(GADDS).The AFM photographs show that the surface of the films is smoothy and the root-mean-square(RMS)increases along with the increase of the thickness.The results of the surface photovoltage(SPV)spectroscopy shows relatively strong signal,indicating the ability for the conversion of photoelectricity.